Question about Sharp AR-235 Copier

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H4-00 Error Code for Sharp AR-168D

We are getting an H4-00 error code.  We know it is either blown a fuser lamp or the thermo fuse is bad.  The tech is now saying replacement of the entire fuse assembly is necessary and now we have to wait on him to order it and then come fix it.  Does anyone know of a quick fix until he can reinstall the assembly?  Is replacement the only way to fix it? We are a law office and this is our only copier and fax machine. We are down without it. Please help!!!

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Your Tech is correct in replacing the Unit.
If the Fuser is not reaching the correct Temp it will give the H4-00 Code

The time and money it takes to repair the unit is greater than replacing.
Oredering all the parts for the unit takes longer then ordering the unit.

The only thing a tech can do is clean the Thermistor, reset with sim 14..
If that works, it might work for a hour, might work for days?

I personally carry this Fuser Unit in my car stock as this happens frequently..

Good luck

Posted on Oct 26, 2008

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H4 COD FOR SHARP 5316

Posted on Aug 19, 2011

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1 Answer

When power is on, H and 4 blink by turns.


your fuser tempature is too low. your lamp may not be coming on. your thermo fuse is bad. your tjermistor is bad. you need a tech to rebuild your fuser

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You have blown your thermal fuse, causing an open circuit.

You have to remove the fuser and remove the thermal fuse. It is very easy to get it, it looks like a round black stump with a shiny bottom with 2 space terminals at each end, the bracket should be white, you cant miss it.

remove the thermistor and throw it hard on the concrete outside, you will not break it, what you are looking for is to make it rattle again, once it rattles again, re-install.. and clear the error code..

To do this you will have to do the following;
Press 'stop/reset' then 'start' then left copy exposure button and hold them all down. This will enter simulation/tech mode.

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H4 is a fuser error. It needs to be replaced by a tech. Sometimes they can reset this error in service program.

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1 Answer

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Then Error code means that the fuser / fixing Lamp is blown or it could be the thirmal fuse is blown. It could also a bad thirmister, that may have caused the fuse to blow. One thing you can look at, will the fixing unit get warm or hot. Do you know any copier techs, as a friend. It is not a easy job to fix this problem. You have to fix it to clear it.... Good Luck

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Replace a lamp on a photocopier


Hello, the C5 code will only show up after the C7 code -- Fuser temp. to low. First put a meter on the Thermal fuse and the Thermistor and see if it is blown. The fuse and thermistor are under the black ( usually) fuser cover which runs the lenght of the fuser. If the fuse and /or thermistor are blown, replace. The lamp will not come on if the fuse or thermistor are blown. If the fuse and thermistor are good then take the end cap off of the fuser ( usually 1 screw) and disconnect the brass (usually) from the lamp. Check the lamp ( continuity), is the lamp okay. If not replace the lamp. If all of these are good then check the Solid state relay unit ( usually in the lower right hand side looking at the back of the machine with cover off). If the relay is good then you have to replace the PWB-A, the main board.

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2 Answers

Sharp AR-275 Getting H2-00 Erron on power on


In AR 275 Sharp copier H2 00 is very common problem, U have to only reset the above fuser error code as fallows

press # then intrrupt then c them intrrupt then display will show simulation mode then enter 14 then press ok key


If this is not enough then press press thermostat on fuser unit by removing the unit from machine this requires tech knowledge

OR you can try by replacing thermistor of fusing unit

If by above procedure the prob is not solved then and then you replace the fusing lamp

Even though u can check the lamp by removing back cover and turn on the machine u can observe the light of fusing lamp

pl ask for any difficulty.

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1 Answer

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Fuser error,
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press start and clear/stop button

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